from rest_framework import serializers
from .models import User, Address
import re
from django_redis import get_redis_connection
from rest_framework_jwt.settings import api_settings
from celery_tasks.email.tasks import send_verify_email
from goods.models import SKU


class CreateUserSerializer(serializers.ModelSerializer):
    """注册序列化器"""

    #序列化器的所有字段:['id', 'username', 'password', 'password2', 'mobile', 'sms_code', 'allow']
    #需要校验的字段:['username', 'password', 'password2', 'mobile', 'sms_code', 'allow']
    #模型中已存在的字段:['username', 'password', 'mobile']

    #需要序列化的字段(输出的字段):['id', 'username', 'mobile', 'token']
    #需要反序列化的字段：['username', 'password', 'password2', 'mobile', 'sms_code', 'allow']
    password2 = serializers.CharField(label='确认密码', write_only=True)#因为模型中映射的字段即序列化又反序列化所有，write_only:只做反序列化
    sms_code = serializers.CharField(label='验证码', write_only=True)#因为模型中映射的字段即序列化又反序列化所有，write_only:只做反序列化
    allow = serializers.CharField(label='同意协议', write_only=True)#因为模型中映射的字段即序列化又反序列化所有，write_only:只做反序列化
    token = serializers.CharField(label='token', read_only=True) #read_only 将token字段序列化

    class Meta:
        model = User #从User模型中映射序列化器字段
        fields = ['id', 'username', 'password', 'password2', 'mobile', 'sms_code', 'allow', 'token']
        extra_kwargs = {#修改字段选项
             'username': {
                 'min_length': 5,
                 'max_length': 20,
                 'error_messages': {#自定义校验出错后的错误信息提示
                     'min_length': '仅允许5-20个字符的用户名',
                     'max_length': '仅允许5-20个字符的用户名',
                 }
             },
            'password': {
                'write_only': True,
                'min_length': 8,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许8-20个字符的密码',
                    'max_length': '仅允许8-20个字符的密码',
                }
            }
        }


    def validate_mobile(self, value):
        """单独校验手机号"""
        # print(value)
        if not re.match(r'1[3-9]\d{9}$', value):
            raise serializers.ValidationError('手机号格式有误！')
        return value

    def validate_allow(self, value):
        """是否同意协议的校验"""
        # print(value)
        if value != 'true':
            raise serializers.ValidationError('请同意用户协议')
        return value

    def validate(self, attrs):
        """校验两个密码是否相同"""
        # print(attrs)
        if attrs['password'] != attrs['password2']:
            raise serializers.ValidationError('两个密码不一致')
        #校验验证码
        redis_conn = get_redis_connection('verify_codes')
        mobile = attrs['mobile']
        real_sms_code = redis_conn.get('sms_%s' % mobile)
        if real_sms_code is None or attrs['sms_code'] != real_sms_code.decode():
            raise serializers.ValidationError('验证码错误')

        return attrs

    def create(self, validated_data):
        # print(validated_data)
        #不需要存储的字段 从字典中移除
        del validated_data['password2']
        del validated_data['sms_code']
        del validated_data['allow']
        # print(validated_data)
        #密码先取出来
        password = validated_data.pop('password')
        #创建用户模型对象，给模型中的username和mobile属性赋值
        user = User(**validated_data)
        #调用User中自带的加密方法
        user.set_password(password)
        user.save()





        # jwt_payload_handler = 'rest_framework_jwt.utils.jwt_payload_handler'
        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER #引用jwt中叫jwt_payload_handler函数（生成payload）
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER #引用jwt中叫jwt_encode_handler函数（生成jwt）

        payload = jwt_payload_handler(user) #根据user返回一个用户相关的载荷
        token = jwt_encode_handler(payload) #传入载荷 返回完成的jwt
#'eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjo3LCJ1c2VybmFtZSI6InNzc3MxMjM0NTYiLCJleHAiOjE2MzIxMDQ2NzYsImVtYWlsIjoiIn0.rXcV30BsgJ4FhKWiBGq5wiwR0DzS95RfZJhLIHjRDuY'
        user.token = token

        return user


class UserDetailSerializer(serializers.ModelSerializer):
    """用户详情序列化器"""
    class Meta:
        model = User
        fields = ['id', 'username', 'mobile', 'email', 'email_active']

class EmailSerializer(serializers.ModelSerializer):
    """更新邮箱序列化器"""
    class Meta:
        model = User
        fields = ['id', 'email']
        extra_kwargs = {
            'email': {
                'required': True
            }
        }
    def update(self, instance, validated_data):
        """重写此方法 不是为了修改 而是借用此时机 发激活邮件"""
        # super(EmailSerializer, self).update(instance, validated_data)
        instance.email = validated_data.get('email')
        instance.save()

        #将来需要在此继续写发邮件的功能
        # send_mail()
        verify_url = instance.generate_email_verify_url()
        send_verify_email.delay(instance.email, verify_url=verify_url)
        return instance

# from django.core.mail import send_mail

class UserAddressSerializer(serializers.ModelSerializer):
    """用户地址序列化器"""
    province = serializers.StringRelatedField(read_only=True)
    city = serializers.StringRelatedField(read_only=True)
    district = serializers.StringRelatedField(read_only=True)
    province_id = serializers.IntegerField(label='省ID', required=True)
    city_id = serializers.IntegerField(label='市ID', required=True)
    district_id = serializers.IntegerField(label='区ID', required=True)

    class Meta:
        model = Address
        exclude = ('user', 'is_deleted', 'create_time', 'update_time')

    def validate_mobile(self, value):
        """验证手机号"""
        if not re.match(r'^1[3-9]\d{9}$', value):
            raise serializers.ValidationError('手机号格式错误')
        return value

    def create(self, validated_data):
        user = self.context['request'].user #获取用户模型对象
        validated_data['user'] = user #将用户模型保存到字典中
        return Address.objects.create(**validated_data)

class AddressTitleSerializer(serializers.ModelSerializer):
    """地址标题序列化器"""

    class Meta:
        model = Address
        fields = ('title',)


class UserBrowserHistorySerializer(serializers.Serializer):
    """
    保存商品浏览记录序列化器
    """
    sku_id = serializers.IntegerField(label='商品sku_id', min_value=1)

    def validate_sku_id(self, value):
        "单独对sku_id进行校验"
        try:
            SKU.objects.get(id=value)
        except SKU.DoesNotExist:
            raise serializers.ValidationError('sku_id 不存在')
        return value

    def create(self, validated_data):
        sku_id = validated_data.get('sku_id')
        #获取当前的用户模型对象
        user = self.context['request'].user
        redis_conn = get_redis_connection('history')
        #创建redis管道
        pl = redis_conn.pipeline()
        # 去重
        pl.lrem('history_%d' % user.id, 0, sku_id)
        # 添加到列表头
        pl.lpush('history_%d' % user.id, sku_id)
        # 截取列表中前5个元素
        pl.ltrim('history_%d' % user.id, 0, 4)
        #执行管道
        pl.execute()

        return validated_data


class SKUSerializer(serializers.ModelSerializer):
    """sku序列化器"""
    class Meta:
        model = SKU
        fields = ['id', 'name', 'price', 'default_image_url', 'comments']
